How does the epidermis protect our skin

The epidermis is the outermost epithelial layer over the skin. This is what you see and touch. It is made up mostly of keratinocytes.

Clearly this layer protects the layers beneath, i.e., the dermis and the subcutaneous layer which both have more delicate functions. It keeps out dirt, debris, bacteria, and basically everything else you don't want inside you. It also forms a protective barrier that protects from damage.

Within the epidermis, melanocytes create melanin to help protect from UV-rays. Lymphocytes and Langerhans cells help to neutralize pathogens.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.